Biggest Single-Day Chart Climb

SQL practice question · Hard · Window Functions · Spotify

`daily_chart` holds the daily chart position of each track (1 = best). A *climb* is an improvement from one day to the NEXT calendar day for the same track: climb = previous position - today's position, counted only when the track also charted on the previous calendar day and the climb is positive. For each track that ever climbed, return its single biggest climb: `title`, `climb_date` (the day it reached the better position; earliest date if tied), `from_position`, `to_position`, `climb`. Order by `climb` DESC, then `title`.

Table: daily_chart

Schema of daily_chart
ColumnType
chart_dateDATE
track_idINTEGER
positionINTEGER
Sample rows of daily_chart
chart_datetrack_idposition
2026-07-01120
2026-07-02112
2026-07-0315
2026-07-0416
2026-07-0123
2026-07-0221
2026-07-0322
2026-07-01340

Table: tracks

Schema of tracks
ColumnType
track_idINTEGER
titleTEXT
Sample rows of tracks
track_idtitle
1Neon Rain
2Paper Moon
3Slow Tide
4Glass City
5Quiet Hours
Expected output on the sample data
titleclimb_datefrom_positionto_positionclimb
Neon Rain2026-07-0220128
Paper Moon2026-07-02312
Slow Tide2026-07-041091

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